Enables potassium channel regulator activity. Involved in protein localization to plasma membrane and regulation of potassium ion transmembrane transport. Acts upstream of or within neuronal action potential and positive regulation of potassium ion transmembrane transport. Located in plasma membrane. Part of voltage-gated potassium channel complex. Is expressed in several structures, including 1st branchial arch; alimentary system; central nervous system; intervertebral disc; and nose. Human ortholog(s) of this gene implicated in amyotrophic lateral sclerosis; autosomal dominant non-syndromic intellectual disability 33; and spinal muscular atrophy. Orthologous to human DPP6 (dipeptidyl peptidase like 6). [provided by Alliance of Genome Resources, Apr 2022]